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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5af7615609499afdfae3ca8b058bb84f24c246813534081c4492ab527dacfe' 
  AND token = 'Qxtu8sHaNbKHA3nTwGTGkd9rqaGmY+Ib73fT8y6UAig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00235

JSON explain

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