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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83c43d94628d9bdc469f15033885817b88c2eb83e37b47759463cf9e02099ec' 
  AND token = 'Xm1HJbNmiNBTONS7eRYd+/YoWLny/p6XIU/5Sn4df9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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