SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcc2d9cf8bddfadbb01140a9d13c587e45b5582bf98bf87f507d35f1607acbc' 
  AND token = 'ZhP9lvH4IWjH9XXoO9r9wzirGxefvT3Y7QJxVKw8JcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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