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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8874d8f93759cc87960ef82d4a5261d06686cab8ef1a372da34af9df275f148c' 
  AND token = 'chJeurCRXAMDHr+J1GM5iEdj1tXadPbMctubP+J9osg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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