SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483dd33650fb37b1c7246e35a0ec7651896da0542f7bfa61d301798265e8268d' 
  AND token = 'bmGvtB3MXXUi3WQFt1Nzhg3S8FH8FCzODNSw7KqK9ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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