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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a171f9c82bcc287cf73c7ab37186f2e13fbec9984e353e18055189e72f2ed0f4' 
  AND token = '9tqeqJmtDYo2L2LD2sb7PpbVV0wItWHvqKzFXwOb2J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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