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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa5fc89bd85d5b017329b3cf62c84093356417dabe282d265a0b3313526f297' 
  AND token = 'qt3o3qWSVZQtLcc2M+scExr2bzyKzD40/z8F23uXgxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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