SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e329e9dd603a757c5bdd6bd5f3363e5dd8c4b4bab3ffc7ea6e3c5a62ce7502ff' 
  AND token = 'czTqaQHUqBGJVxumRJAdM1msf14zh4/1lBHU+vEYy4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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