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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6ee4beca910dff63f0f12270f34501c710f29ed1b7d4058127dc28874c9691' 
  AND token = 'OI76U2rV5YnCcCj9oVaJjFNou8fyn6eWarytg6PxZZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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