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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946444ae7c479f80b36538e772b001e07f87101170f18ba85f8d35eb091b92aa' 
  AND token = 'd4ZkvbP8aJeeidjBmomvVre8Jyn5kpkB89LW6R/Sx6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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