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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6d2342f750151cc402a068d21740813f346801ef2565185e3c1bf94f93a69f' 
  AND token = 'ep3nL/purTCw4EuscwiZ1/hn+UO+3XkiUYfIp4+LdtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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