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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a320dc9d4d217da29fbd0228cd9aa5334a7425ec61758b89b292c80ff7d7d7a8' 
  AND token = 'Ax6hbsrP7smeVMrtmOCVxEdJoBr1j99fdx+/s9hQeFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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