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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0fd144616b8f4659edc7ba93e4d96e76dcb47cd056cc898603df90a27b3969f' 
  AND token = '1ANu8Hh6trPOrrlreKlSgT1idhd3gBJ8/oBO6GBnQPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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