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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f875a51a3599c9a75582ea763026a1acfd9c551a1aceabf97a99f3846ae02bd4' 
  AND token = 'xcJjhkO0+AansZNf1oBGzqX9BkCOl9DtC7EThKlHuIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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