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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b2a97a12dd52174e2b7c782348d47204bf9ce97e8292ec4be1e2465943dff2' 
  AND token = '9JPA+At2LilKNzCBriqPzfv7Ydmq6dTKvf+ZSxje5oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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