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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3be7eb4019558f6dbe1ad2162f50573bd358284af184286cacce88cd6a4e17' 
  AND token = 'XdTa4wQhieJn51Up6V+f9bDqQt8aQnMPiuj2Pb+EABE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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