Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be397ccf971c98716cc3ef70dc83f408016f9765b5e2cb7e19d646ee385829a1' 
  AND token = 'Y55R8f40pzSjSUwgkaOlXMHG1ri2AymeCj+KfUmLBnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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