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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e94eceae95f58c4d38daa7845173d0c2b979bb76f423a505e6dc214c5f618a8' 
  AND token = 'G/5czGWUOhTCBD13TiGPevXX9giQt4y5lIgOkNzIXRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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