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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bf66fb664aae004d17c330d1d508dae542333f2ac2d9195c3f6f3bd17a3337' 
  AND token = 'IFJeUgKi8WsiozOd95hcRtBYiZk0QuPkRP5CG5fd3dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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