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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92c5785430097854da49f69e6589b33a7f0421f587fa83dd3de8ba44443c5ba' 
  AND token = 'hDF441qksDeO2XwbCvNfmCYC50ckQwj5Q/jt2uOpdDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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