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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944072820699fea12fa2a7c79e355e12120d328377f428279dd75030f6f330c9' 
  AND token = 'S9+Eezysm84INJDE/Rdi1quFgK5otlq8e8FZmGY7e70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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