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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbea0ff93fe05ed73743dcd22b0f1097dbde8558cb4514efcfd773b434a8d27' 
  AND token = '7PwwT0GkjRlFrAtCv8wXNYGyhmBG7RwfkF6BJKABlu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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