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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6a7a1d419cf5a26e300c837923788046b8cb5b99c758bc6a9bded7cdf9d96f' 
  AND token = '4vRV0h92p4rwDBD5/3biAq+DjjxCSz7yj3Ucio5FVWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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