SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32aa91d83958c69b4279258b10f3cc5fbaaef0b4c64c646aac985f3fabe6214d' 
  AND token = 'pXwOXGFGlsEGpsaGVZ0OY4NduwJpNJ+4jzAImgoVAlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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