SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007ad5dac5ba65584512156e7ddfa31b08a6b70eb45cf97dee59403efc58351e' 
  AND token = 'r2G+3BqzHlpVKqw9e87BxcpSwhNrCuq52/4mI2uKgiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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