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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe6d2592f876b9ab6c9e875613dbdf764baa13d349a850229178a25a05adf2c' 
  AND token = '0ZS8efFzaFqktZ1lCcmQ1XzfFbE6l5u5ni0dmq3xvw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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