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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9492444186984baf0023e1a6f74e7d78c58cd95367964241ec5d8539e0c35bd6' 
  AND token = 'GTS/WS4EZByd0D//9aGRsGCgkWNg8jm7smUqNeFrzFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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