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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5705faffec7cb14df9cae5dd5e6f466119b030c27caca75b6a50ba33d0eaa81a' 
  AND token = 'SA9cs46QQSas+LwnPyZGTfMe2rOG5VtkuyFdb9VDGz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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