Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6df673cb89a0cf98dda19a550014b41f71924f9fdde5a0b3d9ca934100d2b1c' 
  AND token = '+4kURlJhn5O1tmWc0btQtHwhWTKY4RHirFsu/eGCvoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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