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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f2676cbfb1245db7b2ffaca3a488a8cd95196766a267031ebbbd5f922cfb4b' 
  AND token = 'GZw9A2m10+B5Ea/Xbh2e/z/3sNUzKO7hk+pHpTIrkH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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