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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfea13adc8ee6ffa33952c6e319422fc263cd81cd23d44ecf689bbcbfd93651' 
  AND token = 'B/rq0Z05e/Kuy3nax0QQkq3Zd6lFtR1VbR/1aLLs6vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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