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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee1529af0151fe6acfb648e730847355e109254e1f03bdee571850266ae9b97' 
  AND token = 'K0iclS/JerB9Fi4tWLzi0hpSZVogy/jmxL/OYp05h8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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