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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027af8b3961a5fff91ec78d99d0aadb3cd32f94127cfd687750adadc70ef30ba' 
  AND token = 'cz3miED40CpdkTnAHZsmaTk7cnpRyc/lYYIdYhWtZqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00191

JSON explain

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