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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9bc6f0a95a312b8717595fdde7f674c4d2870aa041821ab9675f7bb688ab1c' 
  AND token = 'UWiPvAjr8+PMtCJ3jtchua1Mo4N7S0DPVidahFeu2co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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