SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9781e4dba859bf18a2e34c0220fb4697ea193ea7f4f6b7b9d08d2209f2719843' 
  AND token = 'pgUtK7hllJ4+ljEHz06QlIqErSyPvHvyABTWX1wbEhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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