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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0054e86ffcf86e962e64a472c74661b6bc6e5d179c631b729acead838650a012' 
  AND token = 'xmb1KwgrNGbfwUML2S5w2VzoPjdsOT9XZ+PP/7eIXzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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