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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3d2c145af68ffa6c63d1def91f2ab98a47e496cfa25599505761bf7fe61aed' 
  AND token = 'VthvB2E3OW/VQrDN3eck1iOPk+0BGd88ypDYPuWB88E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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