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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f26e575c0825030784c0e83415f8478625e421d1ef545c86914738b47ce887' 
  AND token = 'ta4rEXzUZasCC7TDigngjM+UmbmGNHhN+Mr5bbTICcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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