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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0374580a929a8bf76b49ac8cd6e3932e52fc2d59a3b89d90e11b51ec768eb66' 
  AND token = 'P9J3tyFrFHaxTw+zO/Hk+FT/egSd6anpy3nZd6Jdwfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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