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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377a030edc65a9a1b83ec78089992294e5b586c297a48b9f814f4638f52b9c9d' 
  AND token = 'OP6CFfT+5ZkW4WYbXR2m+VsggP9dfMWYYneNElYq8ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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