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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1dcea2629f1ebae4af71cce2e4ba22ad3939f37ed33a827a8024cad133e4b9' 
  AND token = 'nmgiydAI73g4FHI+ug+0J4F/M4+jK9FRMbDXb0qTA00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}