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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b711591ac32a533f805661d0bab27e5b37b7a5a1dd308201058989c3df21a6af' 
  AND token = 'QEpdwokt5ckRjhwhRSb8BDKGwfyn5m2xN5jsh1HOuRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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