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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e210c965f3d560657f93750ee3a4923fa2127d7b445876b62ea65233249d6f00' 
  AND token = 'WKqR+e0kbnt1i3muyddDHXKwFsZ12zbOUrrzTNB6Nec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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