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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8c42094c7e866709630fbc686b1ec6c35da83a057cfda9dfa51cd597b3117f' 
  AND token = '3m++eVqMaZbTJsUZhL8AukGeMZ+B3Sm2Zaa0nc8lb9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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