Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3f782876e51fee9409e605d281212d7f9709f412037595bc491cac672a39b5' 
  AND token = 'zcFW/SX8ortD8XzmxsuCVOcz+r7oHWfJJc0uLGT8CgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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