SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbdee87ab6acedc271915d4ed5dcc734520392f8b872259c396563a5347518a9' 
  AND token = 'GXmAOrFY5VMR5e4tJSwwDbb/ICvvDLUCgg/RiBZMYyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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