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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a3d2da2395ffaa9aab69aad6b7d08496e657a7095254154e3f749f411db58f' 
  AND token = 'bRDbETagUsbJhnlFv72MYmnU/v0Zq/11u+uaF4hCZ7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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