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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe9c91573d8341294891d1815347f4d53d71417691f387ed8af4410b65983d1' 
  AND token = 'j2ip51V4hDYFecm3fwxGJorJBMRrHVIiKpm4o0jw7zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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