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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c88085648eb66214551af8c4f55db2c6b41ec03e1eb93fa364b6a0590f5c17' 
  AND token = 'aj6qx6WufQx+iE+Vt8icrQPSGVacUOuIBUttNAMBRlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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