SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae92cdfc1ebffbbcdf240b52e827cdc1eb7e9574407c358f907fb75f368a758' 
  AND token = 'nLO/JtjHF6+jXYMUmaxSMrJtZP8DnELzYpRxJt8//qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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