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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5259daaf2846d29ee57030274f57d56e2463ad9b781ab1eefb502b052c63028a' 
  AND token = 'VFljtB2ReFikVgVM6QJ8IFkU/oFaK+0ULDWL8y1fAog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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