SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6888db4025841f13a73a1fae1a474f8c63d47229b07623463bb3f7671cb392b' 
  AND token = 'XVj2nMHkvsv82XCux4g9tIl/iHzlQVFGLVQrJlBlpKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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