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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691c960f31958238026b231deebe6c45f1f160165b2cec1b7de4f2df973736b7' 
  AND token = 'uDGZSVr/drOQF+HMNQpZZ55tkEH67H5ZXm23Ezrw1sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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