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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac840adc6204f727e21ab8f37862ce5883adb37db13e2129d449394cd23dddbc' 
  AND token = 'Lybf4fjJP5v3FiDMs0sIZbKPbsR2tEy8T6C6jmLIa/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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