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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbd310960b44b342087b010fa67d65432fc40fc71df1aac956161111f9f75b9' 
  AND token = 'ak5fT6YJoPosbnLaHZe2uPsMiu+lG6/Lf8lg7zG2lZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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