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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74adf85ef397a598190c66f31388b1091276fec17f9ca7539395be66328f938' 
  AND token = '1lHlRub64cjsZCU6u08NHIwwp1lkmNz7lZC8/w2jkhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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