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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3d9762a3bde97dd3e3dc934e4c56c8ab5ed603fe9f7d34c46f5abb34d6a0df' 
  AND token = 'jzVPdgdojp4LTNL7j0USKT1nz00M5huamsUEcb5gM5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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