SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b22496e1382ad4456a3ce40375843c5078b0e2e626a2056d8a03b85f53799f7' 
  AND token = 'ZEo/XxUpHyQRlXKfB+ADC5MLAof9QJPCsieCRhz+hU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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