SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47bc386030dc87785665a924a51a5a8bd519ab627d609958189117e7d317f49f' 
  AND token = 'hDdLUm/ksZ7AI86xGvEpJuTjMGXr8zTQN0wCQY/sDwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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