SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d6f4922d1690bdde0fd9c112dfe7f464449401b1caa570f1336656db2ce08c1' 
  AND token = 'Hj13XY1cPzep0BIB5V/oblNYCUZ0FY2PqWv/wLuphGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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