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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e7106b419c8815c174e3670ad308c5e3bb4186dce881a8c005067f4bef1df8' 
  AND token = 'HWxdFcZ0712ais67lBl1T+plIwThfPKHMgi6bP4rAcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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