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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef42ebf47a54f03aa775da5f0e0ae82f82a4818e93186f7b5ef7e6f940c9aaa' 
  AND token = 'irAgvVxqbj9jRTpz20oXWBWe1KpCdeDw8uz+/HOZIas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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