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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9872269c141e6b955e8aa98058a365b098a71b9dc9736704711463a1cb09cbeb' 
  AND token = 'xcP398KUyzIDFZOta/wAbMVhA0oOzo27yhYAIDeMeUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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