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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39f6c7cdd4d8ca76812e840a70d9476e737405af2f21c88f2103d0d5b9de855' 
  AND token = 'pEkXwIoKq7ZAUeME0JvJyFm86jAOxrIkxhQPQPBD5D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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