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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060d0409491d0646fcdbd96bc94d0794988f51cbcd9cc354b0b3feacaac8eeb7' 
  AND token = '2zYGJTwTgCrskqeA5T8lShaj6qw+0Tj/08lxznOJh9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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