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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e638e445a7756f901052ebfd7f4d8fa73e5b31b9a45c640c8becaf05da55cc' 
  AND token = 'HIqD58Spj8DNK4mop4/pjd/ja/N+UmjAj10fOyafv3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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