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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947cbd9b69deb5f29f87e03a09179e65e80a68d0567585b635015abd7bb24af1' 
  AND token = 'tJg12+5biMvw/23KMts0c3lKVIa0SA8OXHn4ZOIULjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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