SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86945557634f14107a73b79ffd3d69e6a4cc68b39d97121458d7cd0f33d37c10' 
  AND token = 'PakyUhuE/jQLCH0rOrX8OojKvMrSop+swL0iqZsgLbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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