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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5a5b6ff0bd3581531696e9b4cbdeb7874ae52224489d562e5f22ece948b41f' 
  AND token = '63hpB3jsSNIgMQfOuSc9IfGVsQLAr8icXAiDholxyjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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